JPH0765520A - Magnetic storage device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an ultra-small magnetic storage device for high-density recording, and an object thereof is to simplify a drive system for vibrating a magnetic head. [Structure] Head beam 54 with respect to beam fixing portion 53
The base portion 54a is formed narrower than the head beam 54 and bendable. Then, the magnetic members 55a and 55b opposed to each other by the gaps 56a and 56b that generate the suction torque on both sides of the base portion 54a are formed across the beam fixing portion 53, the base portion 54a, and the head beam 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-compact magnetic storage device for high density recording.

Although a magnetic disk device is widely used as a magnetic storage device, the number of constituent parts is large and there is a limit to miniaturization. On the other hand, in the future, with the progress of micromechanics technology, an ultra-small magnetic storage device is being demanded.

[0003]

2. Description of the Related Art Conventionally, magnetic disk devices have been mainly used as external storage means for computers and the like. The magnetic disk device is configured to perform magnetic recording / reproduction by moving a magnetic head in the disk radial direction while rotationally driving a disk-shaped magnetic storage medium (magnetic disk).

Therefore, conventionally, a motor for rotating a magnetic disk, a rotary drive mechanism such as a spindle, a flying head mechanism for floating a magnetic head on a disk surface rotating at high speed, and a magnetic head for an arbitrary track on the magnetic disk. A complicated and highly accurate mechanism such as a head actuator for positioning has been required.

However, the conventional magnetic disk device has a large number of constituent parts, requires many steps in the manufacturing process, and has a limitation in downsizing and weight saving of the device.

Therefore, a magnetic storage device has been proposed as a device which has a structure which is fundamentally different from that of the magnetic disk device and which realizes ultra-compact and high-density recording by the micromechanics technology applying a semiconductor process, for example, Japanese Patent Laid-Open No. 5-738.
There is one proposed by the applicant described in Japanese Patent No. 50.

FIG. 7 shows a main configuration of a conventional magnetic memory device. FIG. 7A shows a storage unit 11 in a magnetic storage device. The storage unit 11 includes a ceramic thin plate substrate 12, a magnetic storage medium 14 having a plurality of data cells 13, and a magnetic storage medium 14. It is composed of a head support 16 which supports the head 15.

The substrate 12 is provided with a rectangular guide groove 12b into which a flat magnetic storage medium 14 is fitted, at the center of an upper surface 12a. The magnetic storage medium 14 has guide grooves 1 on both sides.
It is guided by 2b and slides in the Y direction. On the substrate 12a of the magnetic storage medium 14, rectangular data cells 13 as shown in FIG. 7B are arranged in 9 rows in the X direction and 14 in the Y direction.
Formed in rows. Each data cell 13 is formed by coating a magnetic film on a substrate, and arc-shaped storage tracks 13 ₁ ... 13 _n are magnetically recorded on the surface thereof.

The head support 16 is made of a ceramic or metal plate, and has ends 16a and 16b fixed to the upper surface 12a of the substrate 12 and Y from the ends 21a and 21b.
The arms 16c and 16d extending in the direction, and the arm 16
a horizontal crossing part 16e and a horizontal crossing part 16
Head support arm 16 extending from the center of e to the fixed portion side
and f. The magnetic head 15 is attached to the lower surface of the tip of the head support arm 16f. The head support arm 16f has a slit 16g formed in the central portion thereof, and thin-film piezoelectric elements 17 and 18 are formed on both side surfaces thereof to vibrate the head 15 in the A direction.

A flat plate type electrostatic actuator 19 is provided between the magnetic storage medium 14 and the guide groove 12b of the substrate 12 to drive the magnetic storage medium in the Y direction. Furthermore, the upper surface of the substrate 12 and the horizontal support portion 16a of the head support 16
A flat plate type electrostatic actuator 20 is provided between
The head support 16 is driven in the X direction.

That is, in the storage unit 11 of the above-mentioned magnetic storage device, the magnetic head 15 at the tip of the head support 16 is provided.
The recording and reproducing are performed by vibrating on the predetermined data cell 13 of the magnetic recording medium 14, and the magnetic recording medium 14 is moved to perform the recording and reproducing at an arbitrary position.

[0012]

By the way, in vibrating the magnetic head 15 in the above-mentioned storage unit 11,
Piezoelectric elements 17 and 18 are provided almost entirely on the head support arm 16f.

It is an object of the present invention to provide a magnetic storage device which simplifies a drive system for vibrating a magnetic head as an alternative to a piezo element.

[0014]

SUMMARY OF THE INVENTION The above-mentioned problems are solved by carrying out recording and reproduction by mounting a magnetic head on a swingable head assembly which is continuous with a beam fixing portion and contacting the magnetic head with a recording medium to vibrate. In the magnetic storage device, the base portion of the head assembly with respect to the beam fixing portion is formed to be narrower than the head assembly and bendable, and the head assembly with respect to the beam fixing portion is generated by a torque generated by an electromagnetic force. It is solved by providing an exciting means for vibrating at the base portion.

[0015]

As described above, the base portion of the head assembly is formed so as to be narrower and bendable than the head assembly, and this base portion serves as a hinge for vibrating the magnetic head mounted on the head assembly. . That is, the excitation means applies a torque generated by an electromagnetic force to the beam fixing portion and the head assembly to vibrate the head assembly to perform recording and reproduction by the head.

As described above, the exciting means may be configured to generate a torque by an electromagnetic force, and the drive system for vibrating the magnetic head can be simplified.

[0017]

FIG. 1 is a block diagram of the first embodiment of the present invention. FIG. 1 shows an assembly drawing of a storage unit 22 which constitutes a main part of a magnetic storage device 21 (see FIG. 2) of the present invention.

In FIG. 1, the storage unit 22 includes a ceramic thin plate-shaped base 31 and a plurality of data cells 32a.
(See FIG. 7B), and a magnetic storage medium 32,
It is composed of a head support 34 having a magnetic head 33.

A rectangular guide groove 31b into which a flat magnetic storage medium 32 is fitted is provided at the center of the upper surface 31a of the substrate 31. The magnetic storage medium 32 has guide grooves 3 on both sides.
Guided by 1b, it is slidable in the Y direction.
On the substrate 32b of the magnetic storage medium 32, for example, 9 rectangular data cells 32a are formed in the X direction and 14 rows are formed in the Y direction. Each data cell 32a is formed by coating a magnetic film on a substrate 32b, and an arc-shaped storage track is magnetically recorded on the surface thereof.

A flat plate type electrostatic actuator 41 is provided between the guided magnetic storage medium 32 of the substrate 31 and the guide groove 31b of the substrate 31, and the driving force of the electrostatic actuator 41 causes magnetic storage. Medium 32
Are driven in the Y direction.

The electrostatic actuator 41 includes a substrate 31.
A strip-shaped fixed-side electrode 41a (shown by a broken line in the figure) on the surface of the guide groove 31b, and a strip-shaped movable-side electrode 41b (shown by a chain line in the figure) formed on the lower surface of the magnetic storage medium 32. Become. Both electrodes 41a and 41b are finely processed by sputtering or etching, and a plurality of fine electrodes are formed at the same pitch as the track of the data cell 32a or at intervals smaller than the pitch.

The head support 34 is made of ceramic or Si.
The support body fixing portions 51a and 51b formed of a metal plate and fixed to the upper surface 31a of the substrate 31, and the slits 52 extending from the support body fixing portions 51a and 51b in the Y direction.
a _1, stage 52 b ₁ is formed beam 52a, 5
2b, a beam fixing portion 53 provided between the stage beams 52a and 52b, and a head beam 54 which is a head assembly extending from substantially the center of the beam fixing portion 53 are integrally formed.

The magnetic head 3 is attached to the tip of the head beam 54.
3 is mounted, and a base portion 54a, which is a continuous portion with the beam fixing portion 53, is formed narrower than the head beam 54 and bendable. This base 54a is the head beam 5
4 plays the role of a hinge when it vibrates.

Further, on both sides of the base portion 54a, the magnetic members 55a and 55b formed of a soft magnetic member which is an exciting means are integrally formed on the beam fixing portion 53, the base portion 54a and the head beam 54, respectively, by sputtering or plating, for example. It is formed. These magnetic bodies 55a and 55b have gaps 56a and 56b formed at positions where the beam fixing portion 53 and the head beam 54 face each other, and the beam fixing portion 53 is formed.
The coils 57a and 57b are wound around the respective portions.

A movable side electrode 58a is formed on the back surface of the beam fixing portion 53, and a fixed side electrode 58b is formed on the corresponding substrate 31 to form a flat plate type electrostatic actuator 58 for the X direction. Both electrodes 58a and 58b are an assembly of fine electrodes formed in a strip shape by a fine processing technique such as sputtering, like the electrostatic actuator 41 described above.

If the head beam amplitude is increased and the data cell width is increased, the stage beam 52 becomes unnecessary and the head beam substrate 54a can be directly fixed to the substrate 31.

Here, FIG. 2 shows an overall configuration diagram of the present invention. In FIG. 2, since the magnetic storage device 21 is used as an ultra-small storage means, it can be mounted on a substrate (not shown) of an electric circuit by a case 23, for example.

The magnetic storage device 21 is a case 2 made of synthetic resin.
The storage unit 22 is embedded in a recess 23a formed on the upper surface of the storage unit 3, and a control circuit 24 for driving and controlling the storage unit 22 and a signal processing circuit 25 for processing signals such as a write signal and a read signal are provided in an adjacent recess 23b. It is buried.

Therefore, since the storage unit 22 and the circuits 24 and 25 are integrally provided in one case 23, they are easy to handle and can be easily mounted on another substrate or the like. A lid (not shown) for magnetic shielding is attached to the upper openings of the recesses 23a and 23b of the case 23.

Next, the operation of the above-mentioned storage unit 22 will be described.

First, in the electrostatic actuator 41, when a voltage is applied to the electrodes 41a and 41b facing each other, an electrostatic force in the Y direction is generated between the electrodes 41a and 41b, and the magnetic storage medium 32 is driven by this electrostatic force. Move in the Y direction. Therefore, the magnetic head 33 relatively moves the data cell 3
Slide on 2a in the Y direction to trace each track.

Further, since the magnetic storage medium 32 can be slid until it comes into contact with the edge portion in the Y direction while being guided by the guide grooves 31b on both sides by the driving force of the electrostatic actuator 41, the magnetic head 33 is mounted on the magnetic storage medium 32. Magnetic recording / reproduction can be performed on each data cell 32a in the Y direction.

On the other hand, both electrodes 5 of the electrostatic actuator 58
When a voltage is applied to 8a, 58b, both electrodes 58a, 5b
An electrostatic force in the X direction is generated between 8b, and the beam fixing portion 53 of the head support 34 slides in the X direction. At this time, in the head support 34, the support fixing portions 51a and 51b are fixed to the upper surface 31a of the substrate 31, and the pair of stage beams 52a and 5b.
2b bends in the driving direction like a parallel link.

Therefore, the beam fixing portion 53 which supports the head beam 54 linearly moves in the X direction, and the magnetic head 33 is brought into sliding contact with each data cell 32a in the X direction.

Therefore, since the magnetic head 33 can be moved in the X direction by being driven by the electrostatic actuator 58, the magnetic storage medium 32 is moved in the Y direction by the driving force of the electrostatic actuator 41 in the Y direction described above. , Magnetic recording / reproduction can be performed on all the data cells 32a aligned in the Y direction.

Therefore, FIG. 3 shows an explanatory view of the operation of the head beam. As shown in FIGS. 3A and 3B, the base portion 5
AC voltages of the same polarity (including pulse DC voltage with a duty ratio of 50%) are applied to the coils 58a, 58b of the magnetic bodies 55a, 55b formed on both sides of 4a without overlapping the application timing. In this case, it is desirable to control the frequency of the voltage according to the mechanical resonance frequency of the head beam 54.

That is, currents are alternately supplied to the magnetic bodies 55a and 55b to generate magnetic flux in the gaps 57a and 57b, and a torque of attractive force is alternately generated by the electromagnetic force. For example, when a current is supplied to the coil 58b wound around the magnetic body 55b, as shown in FIG.
At b, a suction force is generated to bend the base 54a. The same operation occurs in both magnetic bodies 55a and 55b, and the head beam 54 is simply vibrated in the A direction, that is, the X direction of the data cell 32a of the magnetic storage medium 32.

In this case, by controlling the magnitude of the voltage, it is oscillated with a constant amplitude (at least a width wider than the width of the data cell 32a).

Therefore, the magnetic head 33 has the data cell 32.
A simple oscillation is performed so as to trace the track on the surface of a.
The magnetic head 33 magnetically records the write data in the data cell 32a or reads the data recorded in the data cell 32a by electrically synchronizing with the vibration of the head beam 54.

As described above, the magnetic members 55a and 55b are formed by sputtering, plating, or the like over the beam fixing portion 53, the base portion 54a, and the head beam 54 to constitute the excitation means, so that the magnetic head 33 is vibrated. The drive system can be simplified, and the size and thickness can be reduced. Further, the head beam 54 itself may be formed of soft magnetism.

Next, FIG. 4 shows a main block diagram of the second embodiment of the present invention. FIG. 4 shows the vicinity of the head beam 54 of the storage unit 22. In FIG. 4, the head beam 54 is integrally formed between the head beam 54 and the beam fixing portion 53 via the base portion 54a, as in the first embodiment.

The beam fixing portion 5 on both sides of the base portion 54a
3, the first magnetic bodies (soft magnetic bodies) 61a and 61b having the planar gaps 62a and 62b are provided on the beam fixing portion 53.
Is provided at a position where a part of is cut out. Coils 63a and 63b are wound around the first magnetic bodies 61a and 61b.

Further, the beam fixing portion 5 of the head beam 54
The first magnetic body (soft magnetic body) 61a,
The second portion is provided at a position that substantially covers the gaps 62a and 62b of 61b.
Magnetic bodies (soft magnetic bodies) 64a and 64b are provided. The first and second magnetic bodies 61a, 61b, 64a, 64
Excitation means is constituted by b.

Then, for example, when a voltage is applied to the coil 63a to generate a magnetic flux in the first magnetic body 61a, a torque for attracting the second magnetic body 64a into the gap 62a in the arrow B direction is generated, The base 54a is connected to the first magnetic body 61a.
It bends to the side.

Therefore, like the first embodiment, the coil 63
By alternately applying a voltage to a and 63b, the head beam 54a vibrates in the A direction, and the magnetic head 33 vibrates.

FIG. 5 is a main block diagram of the third embodiment of the present invention. 5A is a plan view and FIG. 5B is a partial side view. FIGS. 5A and 5B show the first magnetic bodies 61a and 61b of the second embodiment provided at a position rotated 90 degrees in the vertical direction in the drawing, and the operation is the same as that of the second embodiment. Similarly to the second magnetic body 64 in the gaps 62a and 62b.
The head beam 5 is generated by the torque with which a and 64b are attracted.
4. The magnetic head 33 is vibrated in the A direction.
Due to the planar structure, the opposing area between the first magnetic body and the second magnetic body can be increased to increase the torque.

Next, FIG. 6 shows a main block diagram of the fourth embodiment of the present invention. A Y-type first magnetic body (soft magnetic body) in which the end portions 71a and 71b are positioned on both sides of the base portion 54a at a position facing the head beam 54 of the beam fixing portion 53 of the storage unit 22 in FIG. 71 is provided by sputtering or the like. The coil 72 is wound around the other end portion 71c. That is, the end portions 71a and 71b of the first magnetic body 71 are provided so that the magnetizations of the same polarity are generated.

On the other hand, on the head beam 54 side, a permanent magnet having end portions 72a and 72b having different polarities corresponding to the end portions 71a and 71b of the first magnetic body 71 is provided as the second magnetic body 72. . Then, a gap 74a is formed between the end portions 71a and 72a, and a gap 74b is formed between the end portions 71b and 72b. The first and second magnetic bodies 71, 72 constitute an exciting means.

Now, the end portion 72a of the second magnetic body 72 has N
Assuming that the poles and the end portions 72b are S-polarized, when an alternating current is passed through the coil 73, the end portions 71a, 71b
Have the same polarity and the polarity changes alternately. Therefore, in relation to the polarities of the ends 72a, 72b of the second magnetic body 72, a repulsive force is generated when the opposite ends 71a, 71b and 72a, 72b have the same polarity, and a suction force is generated when they have different polarities. Occurs.

Therefore, the gap 74 is sandwiched by the base portion 54a.
The repulsive force and the attractive torque are alternately generated by a and 74b, and the head beam 54 vibrates and the magnetic head 33 vibrates.

In the second to fourth embodiments, the first magnetic bodies 61a, 61b and 71 are provided on the beam fixing portion 53 side, and the second magnetic bodies 64a, 64b and 72 are provided on the head beam 54 side. Although the case is shown, the same applies to the reverse arrangement configuration.

In addition, in the above-mentioned first to fourth embodiments, the base 5
Although the excitation means is provided on both sides of 4a, it may be provided on only one side. At this time, the base portion 54a may be formed not at the center portion of the head beam 54 but at the end portion, for example.

[0053]

As described above, according to the present invention, the base of the head assembly with respect to the beam fixing portion is formed so as to be narrower than the head assembly and bendable, and the head assembly with respect to the beam fixing portion is subjected to electromagnetic force. The drive system for vibrating the magnetic head can be simplified by vibrating the base portion by the torque generated in Step 1.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an overall perspective view of the present invention.

FIG. 3 is an explanatory diagram of an operation of a head beam.

FIG. 4 is a main configuration diagram of a second embodiment of the present invention.

FIG. 5 is a main configuration diagram of a third embodiment of the present invention.

FIG. 6 is a main configuration diagram of a fourth embodiment of the present invention.

FIG. 7 is a main configuration diagram of a conventional magnetic storage device.

[Explanation of symbols]

21 Magnetic Storage Device 22 Storage Unit 31 Substrate 32 Magnetic Storage Medium 32a Data Cell 33 Magnetic Head 34 Head Supports 51a, 51b Support Fixing Part 52a, 52 Stage Beam 53 Beam Fixing Part 54 Head Beam 54a Base 55a, 55b Magnetic Material 56a , 56b, 62a, 62b, 74a, 74b Gap 57a, 57b, 63a, 63b, 73 Coil 61a, 61b, 71 First magnetic body 64a, 64b, 72 Second magnetic body

Claims (5)

[Claims] 1. A magnetic head (33) is mounted on a swingable head assembly (54) continuous with a beam fixing portion (53), and the magnetic head (33) is brought into contact with a recording medium (32). In a magnetic storage device for performing recording and reproduction by vibrating, a base portion (54a) of the head assembly (54) with respect to the beam fixing portion (53) is formed narrower than the head assembly (54) and bendable. A magnetic storage device comprising: an excitation means for vibrating the head assembly (54) at the base (54a) portion with respect to the beam fixing portion (53) by a torque generated by an electromagnetic force. 2. The excitation means includes the head assembly (5).
The magnetic storage device according to claim 1, wherein a torque for the vibration is generated on at least one side of the base portion (54a) in 4). 3. The exciting means comprises an integral magnetic body (a magnetic circuit for generating the torque, which opposes the beam fixing portion (53) and the head assembly (54) through a gap (56a, 56b). 55a, 55b), the magnetic storage device according to claim 1 or 2. 4. The excitation means includes first and second magnetic circuits for generating the torque, which are opposed to each other by the gap (74a, 74b) between the beam fixing portion (53) and the head assembly (54). 3. The magnetic storage device according to claim 1, wherein the magnetic storage device is formed of the magnetic material (71, 72). 5. The excitation means comprises the beam fixing part (5).
3) or a first magnetic body (61a, 61a, 62b) having a gap (62a, 62b) formed in the head assembly (54).
61b) and the head assembly (5
4) or the second magnetic body (64a, 64b) formed in the beam fixing portion (53), and the second magnetic body (64a) in the gap (62a, 62b) of the magnetic circuit.
3. The magnetic storage device according to claim 1, wherein a, 64b) is attracted to generate the torque.